Ari, how long does it take for you to submerge the plate in the silver bath? More than one second? A 4x5 plate should be submerged in one second from start to finish, as long as you are not rushing/splashing it.
To be honest, these stripes look more like artifacts from the plate material itself. I assume this is black trophy plate? Is it bare metal on the reverse, or painted white? Do you wipe the surface with alcohol after peeling the plastic off and before pouring collodion? Have you changed brands of trophy plate? Have you tried the same image on the same day, but on glass? If you have an issue like this suddenly appear, do a control test by switching base materials: try one on glass.
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